// wf-signin.jsx — Screen 2: Sign in (PUC-2, PUC-3). Email → one-time code. A/B + states.
const { Screen: SScreen, Wordmark: SWordmark, TopBar: STopBar, Field: SField, CodeField: SCodeField,
  Banner: SBanner, AuthCard: SAuthCard, BrandRail: SBrandRail, WF_T: ST, WF_DS: SDS } = window;
const { Button: SButton, Soul: SSoul } = SDS;

function BackLink({ label = 'Back' }) {
  return <a href="#" style={{ fontFamily: ST.body, fontSize: 14, color: ST.mute, textDecoration: 'none' }}>← {label}</a>;
}
function Heading({ children, sub }) {
  return (
    <div>
      <h1 style={{ fontFamily: ST.disp, fontWeight: 700, letterSpacing: '-0.015em', fontSize: 26, color: ST.star, margin: '0 0 8px', lineHeight: 1.1 }}>{children}</h1>
      {sub && <p style={{ fontFamily: ST.body, fontSize: 14.5, lineHeight: 1.5, color: ST.soft, margin: 0 }}>{sub}</p>}
    </div>
  );
}
const honest = { fontFamily: ST.body, fontSize: 13, color: ST.mute, lineHeight: 1.5, margin: 0 };

// ── Step renderers (shared by A card and B column) ─────────────────────────
function EmailStep({ framing = 'signup', s = {} }) {
  const title = framing === 'login' ? 'Log in' : 'Create your storefront';
  const sub = framing === 'login' ? 'Enter your email and we\u2019ll send you a code to sign in.' : 'Enter your email to begin. No password to create.';
  return (
    <>
      <Heading sub={sub}>{title}</Heading>
      {s.deliveryFail && <SBanner title="We couldn't send the code">The email didn't go out. Try again in a moment — nothing was lost.</SBanner>}
      <SField label="Email" placeholder="you@example.com"
        value={s.email} focus={!s.emailError && !s.value} error={s.emailError} />
      <div style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
        <SButton variant="primary" href="#" disabled={!!s.cooldown}>
          {s.cooldown ? `Resend in ${s.cooldown}s` : 'Send code'}
        </SButton>
        <p style={honest}>We'll email you a one-time code. That's all we need.</p>
      </div>
    </>
  );
}

function CodeStep({ s = {} }) {
  const email = s.email || 'mara@studiofern.com';
  let err = null;
  if (s.codeWrong) err = `That code didn't match — ${s.attempts ?? 2} attempts left.`;
  if (s.codeExpired) err = 'That code expired. Send a fresh one below.';
  return (
    <>
      <Heading sub={<>We sent a code to <span style={{ color: ST.star }}>{email}</span>. <a href="#" style={{ color: ST.lilac, textDecoration: 'none' }}>Wrong address?</a></>}>
        Check your email
      </Heading>
      {s.welcome && <SBanner tone="info" title={s.welcome === 'new' ? 'Welcome to ecomm' : 'Welcome back'}>
        {s.welcome === 'new' ? 'A new account was created for this email.' : 'Signed in to your existing account.'}
      </SBanner>}
      {s.codeExhausted && <SBanner title="Too many attempts">That code is no longer valid. Request a fresh one to keep going.</SBanner>}
      <div style={{ display: 'flex', flexDirection: 'column', gap: 9 }}>
        <SCodeField filled={s.filled ?? 3} error={!!(s.codeWrong || s.codeExpired || s.codeExhausted)} />
        {err && <span style={{ fontFamily: ST.body, fontSize: 13, color: ST.gold, display: 'flex', gap: 6 }}><span aria-hidden="true">◆</span>{err}</span>}
      </div>
      <div style={{ display: 'flex', alignItems: 'center', gap: 16 }}>
        <SButton variant="primary" href="#">Continue</SButton>
        <a href="#" style={{ fontFamily: ST.disp, fontWeight: 500, fontSize: 14, color: s.cooldown ? ST.mute : ST.lilac, textDecoration: 'none' }}>
          {s.cooldown ? `Resend in ${s.cooldown}s` : 'Resend code'}
        </a>
      </div>
      <p style={honest}>The code is good for 10 minutes. If you didn't request it, ignore this.</p>
    </>
  );
}

// ── Direction A — centered card ────────────────────────────────────────────
function SignInA({ step = 'email', framing = 'signup', device = 'desktop', s = {} }) {
  const desktop = device === 'desktop';
  return (
    <SScreen starfield>
      <STopBar pad={desktop ? '0 40px' : '0 22px'} left={<SWordmark size={desktop ? 24 : 22} />} right={<BackLink />} />
      <div style={{ flex: 1, display: 'flex', alignItems: 'center', justifyContent: 'center', padding: desktop ? 32 : 18 }}>
        <SAuthCard width={desktop ? 430 : '100%'}>
          {step === 'email' ? <EmailStep framing={framing} s={s} /> : <CodeStep s={s} />}
        </SAuthCard>
      </div>
    </SScreen>
  );
}

// ── Direction B — split (brand rail + form column) ─────────────────────────
function SignInB({ step = 'email', framing = 'signup', device = 'desktop', s = {} }) {
  const desktop = device === 'desktop';
  if (!desktop) {
    return (
      <SScreen>
        <div style={{ background: `${window.WF_STARFIELD}, var(--wv-night)`, borderBottom: `1px solid ${ST.hair}`, padding: '22px 24px', display: 'flex', flexDirection: 'column', gap: 12 }}>
          <SWordmark size={22} />
          <SSoul size="sm" tone="gold">Your storefront is yours.</SSoul>
        </div>
        <div style={{ flex: 1, padding: '26px 24px', display: 'flex', flexDirection: 'column', gap: 22, justifyContent: 'center' }}>
          {step === 'email' ? <EmailStep framing={framing} s={s} /> : <CodeStep s={s} />}
        </div>
      </SScreen>
    );
  }
  return (
    <SScreen style={{ flexDirection: 'row' }}>
      <aside style={{ flex: '0 0 44%', background: `${window.WF_STARFIELD}, var(--wv-night)`, borderRight: `1px solid ${ST.hair}`, padding: '40px 46px', display: 'flex', flexDirection: 'column', justifyContent: 'space-between', overflow: 'hidden' }}>
        <SWordmark size={26} />
        <div style={{ maxWidth: 360 }}>
          <SSoul size="lg" tone="gold" as="p">We are verbs,<br />not nouns.</SSoul>
          <p style={{ fontFamily: ST.body, fontSize: 14.5, lineHeight: 1.6, color: ST.mute, marginTop: 20 }}>
            One door, two framings. Whether you're signing up or coming back, it's the same honest step — your email, one code.
          </p>
        </div>
        <BackLink label="Back to start" />
      </aside>
      <div style={{ flex: 1, display: 'flex', alignItems: 'center', justifyContent: 'center', padding: '0 64px' }}>
        <div style={{ width: '100%', maxWidth: 400, display: 'flex', flexDirection: 'column', gap: 22 }}>
          {step === 'email' ? <EmailStep framing={framing} s={s} /> : <CodeStep s={s} />}
        </div>
      </div>
    </SScreen>
  );
}

// ── States stack ───────────────────────────────────────────────────────────
const { StateBlock: SStateBlock } = window;
function codeNote(text) {
  return <span style={{ fontFamily: ST.body, fontSize: 13, color: ST.gold, display: 'flex', gap: 6, marginTop: 9 }}><span aria-hidden="true">◆</span>{text}</span>;
}
function SignInStates() {
  return (
    <div style={{ display: 'flex', flexDirection: 'column', gap: 20 }}>
      <SStateBlock label="Invalid email" note="inline field error">
        <SField label="Email" value="mara@studiofern" error="That doesn't look like an email address." />
      </SStateBlock>
      <SStateBlock label="Resend cooldown" note="PUC-2c · 60s per email">
        <div style={{ display: 'flex', flexDirection: 'column', gap: 10 }}>
          <SButton variant="primary" href="#" disabled>Resend in 47s</SButton>
          <span style={honest}>One code per minute keeps inboxes (and abuse) in check.</span>
        </div>
      </SStateBlock>
      <SStateBlock label="Delivery failed" note="502 · honest failure (INV-9)">
        <SBanner title="We couldn't send the code">The email didn't go out — try again. We'd never fake a success.</SBanner>
      </SStateBlock>
      <SStateBlock label="Wrong code" note="PUC-2a">
        <SCodeField filled={6} error />
        {codeNote("That code didn't match — 2 attempts left.")}
      </SStateBlock>
      <SStateBlock label="Expired code" note="PUC-2b">
        <SCodeField filled={6} error />
        {codeNote('That code expired. Send a fresh one below.')}
      </SStateBlock>
      <SStateBlock label="Attempts exhausted" note="5 tries · code invalidated (INV-3)">
        <SBanner title="Too many attempts">That code is no longer valid. Request a fresh one to keep going.</SBanner>
      </SStateBlock>
      <SStateBlock label="Honest welcome" note="PUC-3 · same flow, true label">
        <div style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
          <SBanner tone="info" title="Welcome to ecomm">A new account was created for this email.</SBanner>
          <SBanner tone="info" title="Welcome back">Signed in to your existing account.</SBanner>
        </div>
      </SStateBlock>
    </div>
  );
}

Object.assign(window, { SignInA, SignInB, EmailStep, CodeStep, SignInStates });